Custom Entity - date different per account

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  I have a custom entity that contains different operativesystems that I can bind to different accounts (through a N:N relation)
  So I can attach windows 7 to all accounts(customers) that have Windows 7.
  
  But now I would like to extend this, to have a date-field belonging to the Windows 7.
  The easy was would ofcourse be to just have a date-field in the form for it,
  but that will give the same date on ALL accounts in their entity for Windows 7.
  
  I would like to be able to set a different date on each account.
  For example:
  Account 1
  - Custom Entity
       - Windows 7
           - Installed: 2013-01-12
  
  Account 2
  - Custom Entity
       - Windows 7
           - Installed: 2014-01-03
  
  How can I create this?

  Tuesday, January 14, 2014 11:31 AM